Mechanical stretch properties mean it'll remain free-flexing on your body, even though it's cut with a slimmer fit. Ventilated underarm zones keep you from becoming a sweaty mess on the trail and the triple-flip collar offers a number of wearable configurations to your particular needs. Additionally, the shirt enjoys a UPF 50 rating, meaning it'll keep you from sizzling along exposed desert environments and high-altitude trails where the sun is brutal in summertime.